Path Mode Graphics
2-19
Two Lines
The preceding example illustrated construction of a path between points specified in
terms of absolute coordinates. The following program draws two lines, using both abso-
lute coordinate specification and a new method: relative coordinate specification.
!R! RES;
NEWP;
PMZP 1, 1;
PDZP 2, 3;
PMRP .5, -1;
PDRP -1, -1;
SPD 0.04;
STRK;
PAGE;
EXIT;
Figure 2. 15. Drawing Two Lines
The first four lines of this program are identical to the preceding example. Line 1
switches the printing system to the PRESCRIBE mode and resets printing system param-
eters, line 2 empties the current path, and lines 3 and 4 draw a line between two points
that are specified in terms of absolute coordinates.
On line 5, the PMRP (Path, Move to Relative Position) command moves the cursor to the
point half an inch to the right and one inch above the current cursor position; that is, the
point at which the first line ends. Then the PDRP (Path, Draw to Relative Position) com-
mand on line 6 draws a line to the point 1 inch to the left of the new position and 1 inch
below it.
The line thickness is changed to 0.04 inches by the SPD command on line 7.
Finally, the STRK command on line 8 strokes the path onto the page, PAGE prints out
the page, and EXIT ends the PRESCRIBE mode.
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